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Lazy summer afternoons spent playing endless games of Sutli or hopscotch or any of those absorbing games have often become the topic of endless reminiscing about the good old days.Well, let's bring them back! With a math slant at that. Can the shapes made with knotted string lead to a better understanding of Euclidean geometry and 3D space? Can the mobiles which hang over a baby's crib be used to understand how to solve equations? Can a teacher see how easy it is to reinvent a toy or a game in order to teach a mathematical concept or two? It's time to Deja View mathematics!

The issue you hold in your hand may look the same as the previous eighteen issues but there are significant changes which I take pleasure in bringing to your notice. For one, At Right Angles is now a whole school math resource, instead of just a High School math resource, with only the PullOut catering to the primary section. To mark this change, we have included a discreet colour band at the top of each article; the code is given in the Contents Rage. It indicates whether the article is best suited for Primary (1- 5), Middle School (6-8), High School (9-10) or Pre-University (II-12). Please don't restrict your reading to just the section you teach; there is plenty there for all those interested in mathematics and as usual, we do our best to make the content accessible and engaging. You may notice that some of the ClassRoom articles also have a boxed item on the first page that indicates the scope of the article and the different ways that the teacher can make use of it. Again, don't let us contain your idea and imagination and do write to us if you think of innovative take-offs on our articles!

Celebrating the artist and his craft is not often associated with the science of mathematics. This issue of At Right Angles opens with just that - a series of problems based on Triangular Numbers presented by three mathematicians at the Institute of Mathematical Sciences, Chennai...

Gender has often played a role in the field of mathematics with studies being conducted on whether boys are better than girls in mathematics, and why there are so few female mathematicians in the field. Which is why At Right Angles has chosen to focus on the theme 'Women in the field of math education' in this issue. And there are other stories, proofs & problems. Read on.

Symmetry, infinity & triangles are the chief ingredients that will keep you engaged in 2016's first issue of At Right Angles. By the way, the year 2016 itself is a triangular number. We are continuing with the Desmos-based activity & of course the recurring theme at AtRiA, nay mathematics itself 'How to Prove It'. Also find in the pages, the review of professor Ian Stewart's book 'Taming the Infinite'. And as a finishing touch, this issue's Pullout section addresses Word Problems, a historically an area of difficulty for school students.

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After a few general questions that I asked them, they (the children) said that they had some questions to ask me. And then one after the other, the children began to ask questions. In some sense, to me, it reflected the freedom of expression that the school seemed to be inculcating.